let unknownValue: unknown = "string";
let unknownNumber: unknown = 12;
let anyValue: any = "1";
let str = "str";
// unknown 类型赋值
anyValue = unknownValue;
unknownNumber = unknownValue;
str = unknownValue;
// 1. unknown 类型只能赋值给 any 类型 和 unknown 类型  不能赋值给其他类型了

// any类型赋值
unknownValue = anyValue;
str = anyValue;
// 2. any 类型可以赋值给任意类型
